At 3 months, it could go either way. The comb is big for a hen of that age, but not impossible. If it's rooster it will soon begin growing sharp, pointed saddle feathers - they look very different from a hen's rounded saddle feathers and are easily distinguished. It will also hold itself taller and have a raspy voice.
Catalana's are a standard breed. Your little buff chicken is almost certainly bantam. Black-Tailed Buff Japanese Bantam fits the description because of the tail, which as you can see is held very high - BTB is also one of the most common colors of Japanese, making it the most likely possibility.
The little crested bird could be part Polish, but probably isn't purebred, based the crest. What he has is a partial crest, and it doesn't look like it's going to grow out like a Polish's crest does. Polish have round, wide crests, which fall into their eyes.
Oriental gamefowl are amazing birds! They come in many different breeds - some common examples are Asil, Shamo, Malay, and Thai. Some of these breeds are quite rare - there are estimated to be only several hundred Malays (the tallest chicken breed, with roosters standing over 3 feet tall) in the US! Orientals originate in many Eastern countries and continents, including Japan, Vietnam, India, Madagascar, and many of the surrounding areas! They are some of the most ancient chicken breeds, some of them dating back thousands of years. They were originally bred for cockfighting - this means that they can be quite feisty when around other chickens (it is said roosters cannot be kept together for fear of killing each other, and hens will occasionally tussle as well!). They may sound more like foul than fowl, but I assure you they are some of the best breeds in the world. They are hardy to heat and cold, resistant to many diseases, and have admirable spirit! They are also some of the friendliest birds in the world. Friendlier than Silkies, friendlier than Brahmas, friendlier than anything! Because cockfighting requires many hours of training, the most tame and easily handling birds were selected for breeding. They make amazing pets - even birds who were rarely handled as chicks will come right up to you! I have a 50% oriental game chick right now, who is 10 weeks old... he has been handled for maybe 15 minutes in his entire life... still he will come right up to me, sit on my boots, or go to sleep in my arms. Orientals also have a very important place in history! In addition to being very primitive breeds, they were one of the most important breeds in the development of the modern industrial meat bird! Their tall, muscular bodies (some weighing over 12 pounds) were used to create the Standard Cornish, which was then used to create all modern "broiler" chickens - of which over 7 billion are raised each year in the U.S. alone! And although they are poor layers, the few eggs they do lay are often quite large, and very tasty!
